Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site watdcsu.UUCP
Path: utzoo!watmath!watdcsu!haapanen
From: haapanen@watdcsu.UUCP (Tom Haapanen [DCS])
Newsgroups: net.auto,net.consumers
Subject: Re: Re: No Leaded Gas -- Now What?
Message-ID: <1109@watdcsu.UUCP>
Date: Thu, 14-Mar-85 09:42:50 EST
Article-I.D.: watdcsu.1109
Posted: Thu Mar 14 09:42:50 1985
Date-Received: Fri, 15-Mar-85 00:06:01 EST
References: <263@ttidcc.UUCP>
Reply-To: haapanen@watdcsu.UUCP (Tom Haapanen [DCS])
Organization: U of Waterloo, Ontario
Lines: 30
Xref: watmath net.auto:6085 net.consumers:1981

In article <263@ttidcc.UUCP> hollombe@ttidcc.UUCP (Jerry Hollombe) writes:

>To run unleaded gas, replace your old valves and valve seats with the case-
>hardened type designed for unleaded.

These are not always available.  I have not seen any unleaded-type
valves for VW Bugs (which would really need them due to high cylinder
head temperatures).  And I've seen a LOT of different typese of valves
available, in many sizes and materials.  All for leaded gas.  Maybe
there will be some for unleaded too Real Soon Now since EPA has
decided what we're allowed to drive.

>Changing the compression ratio  of  your  cylinders  means  changing  their
>physical geometry.  This can be done by using a crankshaft with a different
>throw and/or by using different pistons. (Milling the cylinder  heads  will
>raise the compression ratio -- not what you want.)

The compression ratio can sometimes also be changed by adding head
spacers.  At least for (air-cooled) Porsches and VWs you can purchase
spacers to lower your compression.  This is necessary if you have a
way oversize engine (such as a 2180 or 2331 cc) with an inherently higher
compression ratio and want to use regular gas.


				   \tom haapanen
				   watmath!watdcsu!haapanen
Don't cry, don't do anything
No lies, back in the government
No tears, party time is here again
President Gas is up for president		 (c) Psychedelic Furs, 1982